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AES_InitInvSBox_R.S
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AES_InitInvSBox_R.S
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#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#
# #
# AVR-AES-Faster Library #
# (c) 2020 Rados³aw Gancarz <radgan99@gmail.com> #
# #
# This Source Code Form is subject to the terms of the Mozilla Public #
# License, v. 2.0. If a copy of the MPL was not distributed with this #
# file, You can obtain one at http://mozilla.org/MPL/2.0/. #
# #
#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#
#include "AVR-AES-Faster-devel.h"
#ifdef AES_BENCHMARK
#include <avr/io.h>
#endif
#============================================================================
#
# AES_InitInvSBox_R
#
# AES inverse S-Box generator for RAM variant
#
# Input : C_00(=0)
# Output : None
# Modified: ISBXPTR, C_09, C_1B, C_63, VAL, INVVAL, BOXVAL, TMP0, TMP1
#
#define C_00 r1
#define C_09 r18
#define C_1B r19
#define C_63 r20
#define VAL r21
#define INVVAL r22
#define BOXVAL r23
#define TMP0 r24
#define TMP1 r25
#define ISBXPTR_L r26
#define ISBXPTR_H r27
#define ISBXPTR X
.section .text.AES_InitInvSBox_R,"ax",@progbits
.global AES_InitInvSBox_R
AES_InitInvSBox_R:
#ifdef AES_BENCHMARK
lds r30,_SFR_MEM_ADDR(TCNT1L)
sts benchmark_data+0,r30
lds r30,_SFR_MEM_ADDR(TCNT1H)
sts benchmark_data+1,r30
#endif
#ifdef AES_BENCHMARK
lds r30,_SFR_MEM_ADDR(TCNT1L)
sts benchmark_data+2,r30
lds r30,_SFR_MEM_ADDR(TCNT1H)
sts benchmark_data+3,r30
AES_InitInvSBox_R_start1:
.global AES_InitInvSBox_R_start1
#endif
#------------- Real function starts here -------------
ldi C_63,0x63
ldi C_1B,0x1b
ldi C_09,0x09
ldi ISBXPTR_H,hi8(AES_InvSBox_R)
mov ISBXPTR_L,C_63
st ISBXPTR,C_00
ldi VAL,1
ldi INVVAL,1
100:
mov BOXVAL,INVVAL
mov TMP0,BOXVAL
lsl TMP0
adc TMP0,C_00
eor BOXVAL,TMP0
lsl TMP0
adc TMP0,C_00
eor BOXVAL,TMP0
lsl TMP0
adc TMP0,C_00
eor BOXVAL,TMP0
lsl TMP0
adc TMP0,C_00
eor BOXVAL,TMP0
eor BOXVAL,C_63
mov ISBXPTR_L,BOXVAL
st ISBXPTR,VAL
mov BOXVAL,VAL
mov TMP0,BOXVAL
lsl TMP0
adc TMP0,C_00
eor BOXVAL,TMP0
lsl TMP0
adc TMP0,C_00
eor BOXVAL,TMP0
lsl TMP0
adc TMP0,C_00
eor BOXVAL,TMP0
lsl TMP0
adc TMP0,C_00
eor BOXVAL,TMP0
eor BOXVAL,C_63
mov ISBXPTR_L,BOXVAL
st ISBXPTR,INVVAL
mov TMP0,VAL
# xtime2
lsl TMP0
brcc 1f
eor TMP0,C_1B
1:
eor VAL,TMP0
mov TMP0,INVVAL
lsl TMP0
eor INVVAL,TMP0
mov TMP0,INVVAL
lsl TMP0
lsl TMP0
eor INVVAL,TMP0
mov TMP0,INVVAL
swap TMP0
andi TMP0,0xf0
eor INVVAL,TMP0
brpl 1f
eor INVVAL,C_09
1:
cpi VAL,0xfb
brne 100b
#-------------- Real function ends here --------------
#ifdef AES_BENCHMARK
AES_InitInvSBox_R_end1:
.global AES_InitInvSBox_R_end1
lds r24,_SFR_MEM_ADDR(TCNT1L)
sts benchmark_data+4,r24
lds r24,_SFR_MEM_ADDR(TCNT1H)
sts benchmark_data+5,r24
#endif
#ifdef AES_BENCHMARK
lds r30,_SFR_MEM_ADDR(TCNT1L)
sts benchmark_data+6,r30
lds r30,_SFR_MEM_ADDR(TCNT1H)
sts benchmark_data+7,r30
#endif
ret
#ifdef AES_BENCHMARK
AES_InitInvSBox_R_end:
.global AES_InitInvSBox_R_end
#endif
.size AES_InitInvSBox_R,.-AES_InitInvSBox_R
#undef C_00
#undef C_09
#undef C_1B
#undef C_63
#undef VAL
#undef INVVAL
#undef BOXVAL
#undef TMP0
#undef TMP1
#undef ISBXPTR_L
#undef ISBXPTR_H
#undef ISBXPTR